Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income	$ 414,758	$ 291,487	$ 270,856
Other comprehensive loss:
(Decrease) increase in unrealized value of derivative instruments, including SLGOP's share of joint venture derivative instruments	(39,743)	(47,118)	(3,622)
(Decrease) increase in unrealized value of marketable securities	(1,318)	1,249	60
Other comprehensive loss	(41,061)	(45,869)	(3,562)
Comprehensive income	373,697	245,618	267,294
Net income attributable to noncontrolling interests and preferred units distributions	(43,703)	(21,053)	(23,594)
Net loss attributable to noncontrolling interests	(14,940)	3,159	6
Other comprehensive loss attributable to noncontrolling interests	2,299	2,276	66
Comprehensive income attributable to SL Green/SLGOP	332,293	226,841	243,766
SL Green Operating Partnership
Net income	414,758	291,487	270,856
Other comprehensive loss:
(Decrease) increase in unrealized value of derivative instruments, including SLGOP's share of joint venture derivative instruments	(39,743)	(47,118)	(3,622)
(Decrease) increase in unrealized value of marketable securities	(1,318)	1,249	60
Other comprehensive loss	(41,061)	(45,869)	(3,562)
Comprehensive income	373,697	245,618	267,294
Net loss attributable to noncontrolling interests	(14,940)	3,159	6
Other comprehensive loss attributable to noncontrolling interests	2,299	2,276	66
Comprehensive income attributable to SL Green/SLGOP	$ 361,056	$ 251,053	$ 267,366